Explanation:
Although you've surely seen it, you might not have noticed it.
During a cloudless
twilight, just before sunrise or after sunset, part of the atmosphere above the
horizon appears slightly off-color, slightly pink.
Visible in the
above photograph, this off-color band between the
dark eclipsed sky and the
blue sky can best be seen in the direction opposite the Sun
and is called the Belt of
Venus.
Straight above,
blue sky is normal sunlight reflecting off the atmosphere.
In the Belt of Venus, however, the atmosphere reflects light
from the
setting (or rising) Sun which
appears more red.
The Belt of Venus can be seen from any location
with a clear horizon.